I was trying to send alert from Grafana to ignition using webhook Post method. When I was trying to do test connection then below error coming.
Failed to send test alert.: Post "https://ignition*****com:443/system/webdev/Alerts/Grafana/Grafana": tls: failed to verify certificate: x509: certificate signed by unknown authority
Need some support to resolve this issue.
Where did you get your server's certificate? If self-signed, you will have to get a real one. If already real, you should check for interference from corporate firewalls playing man-in-the-middle.
Getting a real certificate from Let's Encrypt is what I recommend.
... and leveraging DNS-01 challenges for non-public servers is a great way to get it done--as long as you control the domain, you can use TXT records as the validation mechanism.